An ultra-high nickel cobalt-free cathode material toward high-energy and long-cycle stable Li-ion batteries: a single-crystal and surface high-entropy design strategy

We developed a Mg/Nb/Al co-doped single-crystal LiNi 0.9 Mn 0.1 O 2 with improved cycling stability. The high-entropy surface stabilizes oxygen, enhances phase transition reversibility, and builds a HF-resistant CEI.